Hello. Does anyone know where I can find the the subject in Bangkok? For example, Philips FC8950 (http://www.philips.com.sg/c-p/FC8950_01/aquaaction-bagless-water-filtration-vacuum-cleaner-with-aquaweb-technology-and-triactive-nozzle/overview)/Karcher DS 6.000 or anything else with aqua filter. I've tried to look for some models I'm sure have a water filter on Lazada but no luck. 

Homeworks have (or did have) them. Don't recall the brand but not Philips, I think.

Watsadu also might have them..

"Verasu" offers Kärcher vacuum cleaner with water filter (KAR-DS6000MED)

I also want a KArcher vacuum, went to see them in the shop and they are not the same quality...even dangerous since there's no ground cable...and that for a water vacuum cleaner.

 

I've seen the new model, professional line (grey color) 55db (very silent) for 250 euro in Germany...i will bring one of those.

There are many  that have water filter, like Maxkon, Philips like your link. Contrary to standard floor cleaners, the newly-developed cleaner water filtration system works with the natural power of water. As a consequence of its high suction power, this type of water in your filter is rotated at high-speed. This rotating water column efficiently filters out any sucked-in dust and immediately binds it within the water bath. The end result is fresh and clean air, which helps allergy sufferers. As the vacuum cleaner has a water filter, filter bags - in which allergens can multiply - are no longer needed, and mite excretions are simply emptied out with the water after use. Another advantage for allergy sufferers is that there is no longer a cloud of dust when emptying the vacuum cleaner.